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Re: Earth friction on sonotubes

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I would think the cardboard form would prevent a good concrete-soil bond.
If I were to consider any frictional effects I would want to cast the
foundation directly against the soil. But I am like you and would mainly
count on the dead load of the concrete.

On Mon, Feb 24, 2014 at 11:49 AM, Drew Morris <dmorris(--nospam--at)> wrote:

> I am reviewing the design of a foundation for a small barn for horses, 
> 30' x 36'.  The designer is using sonotubes of various diameters with an 
> embed depth of 2'-6".  To counter the uplift, the designer  is using the 
> self weight and is counting on friction between the sonotube and the 
> earth per IBC 2009 1810.3.3.4.  Section 1810 is for deep foundations and 
> would not apply for this setting. The minimum depth for the bottom of the 
> sonotubes as part of a cold footing is 60", so it will be easy to resize 
> the diameter and just use the self weight to counter the uplift.
> --
> *
> Drew Morris, PE*| Project Engineer
> BBFM Engineers, Inc. <>
> 510 L Street, Suite 200 | Anchorage, Alaska 99501
> Ph: (907)274-2236 | Direct: (907)270-2240 | Web:

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